The long-run market supply curve is positively sloped when

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The long-run market supply curve is positively sloped when external diseconomies exist. This means that as more firms enter the market and increase production, the costs of production increase for all firms, leading to a higher equilibrium price in the long run. This is because when firms are producing at a very large scale, they may cause pollution and other negative impacts on the environment that affect everyone, resulting in higher costs for all firms.

The Long-Run Market Supply Curve Is Positively Sloped When